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Data backup and recovery has witnessed continuous change with the arrival of data de-duplication and backup systems that are disk-based. Disk systems that are conventional are suitable for short retention along with recurrent access, while tapes are suitable for long retention with irregular access. Data duplication technology offers a similar performance as conventional disk but it provides a gainful retention. Being a major technology that enables replication, de-duplication makes it sensible for managers of IT to connect dispersed sites and make media management easy throughout the enterprise. This paper looks at the effect of de-duplication in a recovery and backup environment that is Disk-To-Disk-To-Tape (D2D2T). The paper also gives a backdrop on the power and limits of the present backup systems that are based on disk and tape. It reveals the perfect applications of de-duplications to satisfy the needs of broad range of customers. Furthermore, the paper discusses how the advantages of D2D2T have improved with the involvement of backup systems that are based on de-duplicated disk. If each technology is appropriately implemented in the data protection lifecycle, a balance is achieved between cost and performance. De-duplication is an important technology that bridges the break between conventional tape and disk, and brings better stability between retention and accessibility, while improving TCO. In conclusion, this paper shows that an integrated multi-tier backup system that leverages de-duplication and distant duplication can offer a backup solution, balancing short retention and long data retention and bringing an overall cost effectiveness.
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